Effects of cigarette smoking on the circadian rhythm of heart rate variability.

Abstract:

BACKGROUND:The effects of cigarette smoking on the circadian rhythm of heart rate variability (HRV) are not known. METHODS:We studied the effects of cigarette smoking on the circadian rhythm of HRV in 24 smoking and 21 non-smoking healthy subjects. Twenty-four hour ambulatory electrocardiograms were recorded and time domain parameters of HRV (SDNN [standard deviation of all R-R intervals], SDANN [standard deviation of the averages of R-R intervals in all 5-minute segments of the entire recording], RMSSD [the square root of the mean of the sum of the squares of differences between adjacent R-R intervals]) were determined for the entire 24-hour period and for each 3-hour period. RESULTS:In total, SDNN and SDANN were significantly lower in smokers than non-smokers (116 +/- 26 vs 136 +/- 27, p < 0.05 for SDNN, 109 +/- 25 vs 121 +/- 24, p < 0.05 for SDANN). However, there were no statistical differences between smokers and non-smokers in heart rate (81 +/- 9 vs 76 +/- 10, p > 0.05) and RMSSD (32 +/- 12 vs 37 +/- 18, p > 0.05). These HRV parameters showed a circadian variation: they increased at night and decreased during the day in both groups. The parameters were lower in smokers than non-smokers during daytime (especially, between 8-14 hours). However, no differences were detected during night-time. CONCLUSIONS:Time domain parameters of HRV (SDNN, SDANN and RMSSD) in both smoking and non-smoking healthy subjects have a circadian rhythm. SDNN and SDANN were lower in smokers than non-smokers during daytime.

journal_name

Acta Cardiol

journal_title

Acta cardiologica

authors

Eryonucu B,Bilge M,Güler N,Uzun K,Gencer M

doi

10.2143/AC.55.5.2005757

subject

Has Abstract

pub_date

2000-10-01 00:00:00

pages

301-5

issue

5

eissn

0001-5385

issn

1784-973X

journal_volume

55

pub_type

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